Aldrin tweeted on Thursday to explain that the photo wasn't planned: "When Neil took this pic of me it was very spontaneous. He said "stop right there" & I turned. You can see the motion of the strap #Apollo11."

Meanwhile, the flight plan for the famous Apollo 13 mission, annotated by its crew, sold for $275,000, while a spacesuit worn by astronaut Gus Grissom fetched $43,750.